上颌中切牙长轴与牙槽骨方向夹角的锥形束CT测量分析

Study of angle between maxillary incisor and alveolar bone using cone-beam CT

目的:利用锥形束CT(cone-beam CT,CBCT)测量、分析上颌中切牙长轴与牙槽骨方向夹角角度,为前牙种植美学修复的手术指导和风险评估提供参考。方法:随机选取374例成年患者,按照年龄分成青年、中年、老年3组,拍摄CBCT,通过Kavo eXam Vision软件测量上颌中切牙长轴与牙槽骨方向之间的夹角角度。使用SPSS16.0软件包对数据进行t检验。结果:青年组上颌中切牙长轴与牙槽嵴方向夹角角度为13.81°±4.37°,中年组为15.19°±5.23°,老年组为18.51°±6.62°,各组内男、女比较无显著差异(P>0.05),各组组间比较有显著差异(P<0.05),且随着年龄增大,其夹角角度逐渐增大。结论:患者性别对上颌中切牙长轴与牙槽骨方向夹角角度影响不大;患者年龄和上颌中切牙长轴与牙槽骨方向夹角角度有一定关系。对于上颌前牙种植患者,要达到美观修复,术前需要充分了解上颌中切牙长轴与牙槽骨方向夹角角度,尤其是老年患者。

PURPOSE： To measure the angle between maxillary incisor and alveolar bone by the use of cone-beam CT （CBCT）, in order to assess preoperative risks and provide guidance in anterior dental implantation. METHODS： A total of 374 patients were included and divided into 3 age groups： group 1 （18-34 years）, group 2 （35-59 years） and group 3 （above 60 years）. All patients underwent CBCT preoperatively, the angle between maxillary incisor and alveolar bone was measured though Kavo eXam Vision software. The data were analyzed with SPSS16.0 software package for Student＇s t test. RESULTS： In group l, 2 and 3, the angle between maxillary incisor and alveolar bone was （13.81±4.37）°, In group 2, the ankle between maxillary incisor and alveolar bone was （15.19±5.23）°, （18.51±6.62）°, respectively; there was no significant difference between male and fenmle in each group, but there was significant difference between every 2 age groups in the angle between maxillary incisor and alveolar bone. CONCLUSIONS： The angle between maxillary incisor and alveolar bone is inereasing with the increase of age, but no significant difference between male and female is detected. For patients with dental implantation in anterior area, CBCT should be taken to measure the angle between maxillary incisor and alveolar bone for aesthetic assessment, especially for old patients.